a: \(=\left(-a^2-2a+3\right)^2\)

b: \(=\left(a^2+3\right)^2-4a^2\)

c: \(=-\left(a^2-2a\right)\left(a^2+2a\right)=-\left(a^4-4a^2\right)\)

a: \(=a^2-b^4\)

b: \(=\left(a^2+2a\right)^2-9\)

c: \(=a^2-\left(2a+3\right)^2\)

d: \(=a^4-\left(2a-3\right)^2\)

e: \(=\left(-a^2-2a+3\right)^2\)

g: \(=4a^2-a^4\)

\(a^22\) là a² nhân với 2 đó hả?

\(a,\left(a^22+2a+3\right)\left(a^22+2a-3\right)\)

\(=\left[\left(a^22+2a\right)+3\right]\left[\left(a^22+2a\right)-3\right]\)

\(=\left(a^22+2a\right)^2-9\)

\(=4a^4+8a^3+4a^2-9\)

\(b,\left(a^22+2a+3\right)\left(a^2-2a-3\right)\)

\(=2a^4-4a^3-6a^2+2a^3-4a^2-6a+3a^2-6a-9\)

\(=2a^4-2a^3-7a^2-12a-9\)

\(c,\left(a^22-2a+3\right)\left(a^2+2a-3\right)\)

\(=2a^4+4a^3-6a^2-2a^3-4a^2+6a+3a^2+6a-9\)

\(=2a^4+2a^3-7a^2+12a-9\)

Đoạn đầu cái chỗ (a^2+2a+3).(...) là tách với cái kia chứ không phải 2 cái nhân với nhau đâu

Bài 1:

a) \(\left(a-b^2\right)\left(a+b^2\right)=a^2-b^4\)

b) \(\left(a^2+2a-3\right)\left(a^2+2a+3\right)=\left(a^2+2a\right)^2-9\)

c) \(\left(a^2+2a+3\right)\left(a^2-2a-3\right)=a^2-\left(2a+3\right)^2\)

d) \(\left(a^2-2a+3\right)\left(a^2+2a+3\right)=9-\left(a^2-2a\right)^2\)

e) \(\left(-a^2-2a+3\right)\left(-a^2-2a+3\right)=\left(-a^2-2a+3\right)^2\)

g) \(\left(a^2+2a+3\right)\left(a^2-2a+3\right)=\left(a^2+3\right)^2-4a^2\)

f) \(\left(a^2+2a\right)\left(2a-a^2\right)=4a^2-a^4\)

Bài 2 :

a) \(\left(x+1\right)\left(x^2-x+1\right)=x^3+1\)

b) \(\left(x+y+z\right)^2=\left(x+y+z\right)\left(x+y+z\right)=x^2+xy+xz+yx+y^2+yz+zx+zy+z^2=x^2+2xy+2yz+2xz+y^2+z^2\)

c) \(\left(x-y+z\right)^2=\left(x-y+z\right)\left(x-y+z\right)=x^2-xy+xz-xy+y^2-yz+xz-yz+z^2=x^2+y^2+z^2-2xy+2xz-2yz\)d) \(\left(x-2y\right)\left(x^2+2xy+4y^2\right)=\left(x-2y\right)^3\)

e) \(\left(x-y-z\right)^2=\left(x-y-z\right)\left(x-y-z\right)=x^2-xy-xz-xy+y^2+yz-xz+yz+z^2=x^2-2xy-2xz+2yz+y^2+z^2\)

\(\Leftrightarrow\dfrac{2x}{a^2-a+1}+\dfrac{-4x}{2a^2-2a+2a^2}+\dfrac{2ax}{1+a^3}< \dfrac{1}{2a+2}-\dfrac{1}{2a^2-2a+2}+\dfrac{a}{1+a^3}\)

\(\Leftrightarrow\left(\dfrac{2}{a^2-a+1}-\dfrac{4}{2a^2-2a+2}+\dfrac{2a}{1+a^3}\right).x< \left(\dfrac{1}{2a+2}-\dfrac{1}{2a^2-2a+2}+\dfrac{a}{1+a^3}\right)\)

\(\Leftrightarrow\left(\dfrac{2a}{1+a^3}\right)x< \dfrac{\left(a^2-a+1\right)-\left(a+1\right)+2a}{2.\left(a+1\right)\left(a^2-a+1\right)}=\dfrac{a^2}{1+a^3}\)

\(\Leftrightarrow\left(\dfrac{2a}{1+a^3}\right)x< \dfrac{a^2}{2.\left(1+a^3\right)}\)

\(a=0\Rightarrow vo...N_o\)

\(\left\{{}\begin{matrix}\dfrac{2a}{a^3+1}>0\Leftrightarrow\left[{}\begin{matrix}a< -1\\a>0\end{matrix}\right.\\x< \dfrac{a^2}{2\left(a^3+1\right)}:\dfrac{2a}{\left(a^3+1\right)}=\dfrac{a}{2}\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\dfrac{2a}{a^3+1}< 0\Rightarrow-1< a< 0\\x>\dfrac{a}{2}\end{matrix}\right.\)